Warrant Check API

openapi: 3.0.3
info:
  title: Warrant Check API
  description: 'Warrant was a centralized, fine-grained authorization (FGA) service inspired by Google Zanzibar. Applications defined an authorization model (object types and relations), wrote relationship tuples called warrants between objects, and then ran real-time access checks and relationship queries. The service supported ReBAC, RBAC, and ABAC, plus entitlements (features and pricing tiers). The core engine is open source (Apache-2.0, github.com/warrant-dev/warrant) and self-hostable against MySQL, Postgres, or SQLite; the self-hosted server listens on port 8000 by default. The hosted service used base URL https://api.warrant.dev with API-key authentication via the `Authorization: ApiKey <key>` header.

    STATUS - RETIRED. Warrant was acquired by WorkOS on 2024-04-23 and folded into WorkOS FGA. The standalone hosted Warrant API (api.warrant.dev) and the Warrant-based WorkOS FGA were deprecated and sunset on 2025-11-15. The paths below are MODELED from Warrant''s publicly documented v1/v2 API for historical and access-control reference; they are not a live contract. Verify current fine-grained authorization at https://workos.com/docs/fga.'
  version: '1.0'
  contact:
    name: Warrant (now WorkOS FGA)
    url: https://warrant.dev
  license:
    name: Apache-2.0
    url: https://github.com/warrant-dev/warrant/blob/main/LICENSE
servers:
- url: https://api.warrant.dev
  description: Warrant hosted API (RETIRED - sunset 2025-11-15)
- url: http://localhost:8000
  description: Self-hosted open-source Warrant server (default port)
security:
- apiKeyAuth: []
tags:
- name: Check
  description: Real-time access checks and relationship queries.
paths:
  /v2/authorize:
    post:
      operationId: checkAccess
      tags:
      - Check
      summary: Check access
      description: The hot-path authorization check. Returns whether a subject has the requested relation/permission on one or more objects, optionally evaluating a batch with anyOf/allOf semantics. RETIRED / modeled.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CheckRequest'
      responses:
        '200':
          description: The authorization decision.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CheckResult'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/query:
    get:
      operationId: queryAccess
      tags:
      - Check
      summary: Query relationships
      description: Runs a Warrant Query Language (WQL) expression to enumerate which subjects have access to an object, or which objects a subject can access. RETIRED / modeled.
      parameters:
      - name: q
        in: query
        required: true
        description: A Warrant Query Language expression.
        schema:
          type: string
      - name: limit
        in: query
        schema:
          type: integer
      - name: page
        in: query
        schema:
          type: integer
      responses:
        '200':
          description: Query results.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/QueryResult'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    QueryResult:
      type: object
      properties:
        objectType:
          type: string
        objectId:
          type: string
        relation:
          type: string
        subject:
          $ref: '#/components/schemas/Subject'
        isImplicit:
          type: boolean
    CheckResult:
      type: object
      properties:
        code:
          type: integer
        result:
          type: string
          description: '"Authorized" or "Not Authorized".'
    Subject:
      type: object
      required:
      - objectType
      - objectId
      properties:
        objectType:
          type: string
        objectId:
          type: string
        relation:
          type: string
    Warrant:
      type: object
      required:
      - objectType
      - objectId
      - relation
      - subject
      properties:
        objectType:
          type: string
        objectId:
          type: string
        relation:
          type: string
        subject:
          $ref: '#/components/schemas/Subject'
        policy:
          type: string
          description: Optional ABAC condition (boolean expression) that must hold for the warrant to apply.
    Error:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
    CheckRequest:
      type: object
      properties:
        op:
          type: string
          enum:
          - anyOf
          - allOf
          description: Combines multiple warrant checks in a batch.
        warrants:
          type: array
          items:
            $ref: '#/components/schemas/Warrant'
        context:
          type: object
          additionalProperties: true
          description: Runtime attributes evaluated against warrant policies (ABAC).
        debug:
          type: boolean
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: 'API key passed as `Authorization: ApiKey YOUR_API_KEY`. Self-hosted deployments configure the key via ApiKey in the server config.'